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Arca base64 Autodecoder V2

아카라이브 Base64 자동 복호화

当前为 2023-12-18 提交的版本，查看 最新版本。

  1. // ==UserScript==
  2. // @name         Arca base64 Autodecoder V2
  3. // @version      1.1
  4. // @author       Laria
  5. // @match        https://arca.live/b/*/*
  6. // @description  아카라이브 Base64 자동 복호화
  7. // @icon         https://www.google.com/s2/favicons?sz=64&domain=arca.live
  8. // @run-at       document-end
  9. // @namespace https://greasyfork.org/users/1235854
  10. // ==/UserScript==
  11.  
  12. /*
  13.  * 1.0 - Release
  14.  * 1.1 - Invalid character update (replace -> replaceAll)
  15. */
  16.  
  17. const regArr = [
  18.     /(aHR0cDovL|aHR0cHM6Ly)(\w|=|\+|\/)*(?=[^\+=\w\/])/g,
  19.     /(YUhSMGNEb3ZM|YUhSMGNITTZMe)(\w|=|\+|\/)*(?=[^\+=\w\/])/g,
  20.     /(WVVoU01HTkViM1pN|WVVoU01HTklUVFpNZ)(\w|=|\+|\/)*(?=[^\+=\w\/])/g,
  21. ]
  22. const regInvalid = /[^\w\+\/=]/;
  23.  
  24.  
  25. var Base64 = {
  26.     _keyStr : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
  27.     decode : function (input) {
  28.         var output = "";
  29.         var chr1, chr2, chr3;
  30.         var enc1, enc2, enc3, enc4;
  31.         var i = 0;
  32.  
  33.         input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
  34.  
  35.         while (i < input.length) {
  36.             enc1 = this._keyStr.indexOf(input.charAt(i++));
  37.             enc2 = this._keyStr.indexOf(input.charAt(i++));
  38.             enc3 = this._keyStr.indexOf(input.charAt(i++));
  39.             enc4 = this._keyStr.indexOf(input.charAt(i++));
  40.  
  41.             chr1 = (enc1 << 2) | (enc2 >> 4);
  42.             chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
  43.             chr3 = ((enc3 & 3) << 6) | enc4;
  44.  
  45.             output = output + String.fromCharCode(chr1);
  46.  
  47.             if (enc3 != 64) {
  48.                 output = output + String.fromCharCode(chr2);
  49.             }
  50.             if (enc4 != 64) {
  51.                 output = output + String.fromCharCode(chr3);
  52.             }
  53.         }
  54.  
  55.         output = Base64._utf8_decode(output);
  56.         return output;
  57.     },
  58.     // private method for UTF-8 decoding
  59.     _utf8_decode : function (utftext) {
  60.         var string = "";
  61.         var i = 0;
  62.         var c = 0;
  63.         var c1 = 0;
  64.         var c2 = 0;
  65.         var c3 = 0;
  66.  
  67.         while ( i < utftext.length ) {
  68.             c = utftext.charCodeAt(i);
  69.             if (c < 128) {
  70.                 string += String.fromCharCode(c);
  71.                 i++;
  72.             }
  73.             else if((c > 191) && (c < 224)) {
  74.                 c2 = utftext.charCodeAt(i+1);
  75.                 string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
  76.                 i += 2;
  77.             }
  78.             else {
  79.                 c2 = utftext.charCodeAt(i+1);
  80.                 c3 = utftext.charCodeAt(i+2);
  81.                 string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
  82.                 i += 3;
  83.             }
  84.         }
  85.         return string;
  86.     }
  87. }
  88.  
  89. var hindex = 0; //total index
  90. const max_iter = 3; //max try decode iteration attamp, def:3
  91.  
  92. var lastSelected = document;
  93. var lastSelectedTime = Date.now();
  94.  
  95. function createLink(orig, index, url, depth) {
  96.     return '<a href="' + url
  97.            + '" target="_blank" rel="noreferrer">' + index.toString()
  98.            + '번째 링크 (base64 깊이: ' + depth.toString()
  99.            + ')</a>'
  100.            + '<br>[ <a>' + orig.toString() + '</a> ]';
  101. }
  102.  
  103. function replacerGen(numIter) {
  104.     return function(match) {
  105.         try {
  106.             return_f = ""; //return msg
  107.             console.log(match)
  108.             var converted = Base64.decode(match);
  109.             for(var i=0; i<numIter; i++) {
  110.                 converted = Base64.decode(converted);
  111.             }
  112.             hindex++;
  113.  
  114.             converted = decodeURI(encodeURI(converted).replaceAll('%00', ''));  //remove invalid string - �
  115.  
  116.             converted = converted.split(/\r?\n/);
  117.             if (converted.length > 1) {
  118.               return_f+='[ ' + match.toString() + ' ]';
  119.               nindex = 1;
  120.               converted.forEach(function(k) {
  121.                 if (k != "") {
  122.                   console.log(k)
  123.                   return_f+='<br>' + createLink('링크 자동 분할 : ' + nindex.toString() + '번째', hindex, k, numIter+1);
  124.                   hindex++;
  125.                   nindex++;
  126.                 }
  127.               });
  128.               hindex--; //last components
  129.             } else return_f+=createLink(match, hindex, converted, numIter+1);
  130.  
  131.             return return_f
  132.         } catch(e) {
  133.             console.log(e);
  134.             console.log('base64 변환 실패 : ' + match);
  135.         }
  136.         return '[base64 변환 실패 : ' + match + ']';
  137.     }
  138. }
  139.  
  140. //function disabled
  141. function selClicked(event) {
  142.     var sel = document.getSelection().toString();
  143.     if (!sel.match(regInvalid)
  144.         && sel.length >= 10
  145.         && lastSelectedTime + 200 < Date.now()) {
  146.         try {
  147.             var converted = Base64.decode(sel);
  148.         } catch (e) {
  149.             return;
  150.         } finally {
  151.             this.innerHTML = this.innerHTML.replace(sel, converted);
  152.             this.removeEventListener('click', selClicked);
  153.         }
  154.     }
  155. }
  156.  
  157. (function() {
  158.     'use strict';
  159.  
  160.     var article = document.getElementsByClassName("article-content")[0];
  161.     for(var i=0; i<max_iter; i++) {
  162.         article.innerHTML = article.innerHTML.replaceAll(regArr[i], replacerGen(i));
  163.     }
  164.  
  165.     var comments = document.getElementsByClassName("list-area");
  166.     if(comments.length != 0) {
  167.         for(var i=0; i<max_iter; i++) {
  168.             comments[0].innerHTML = comments[0].innerHTML.replaceAll(regArr[i], replacerGen(i));
  169.         }
  170.     }
  171.     /*
  172.     document.addEventListener('selectionchange', function() {
  173.         var sel = document.getSelection().anchorNode;
  174.         if(sel) {
  175.             sel = sel.parentElement;
  176.             if(sel != lastSelected) {
  177.                 lastSelected.removeEventListener('click', selClicked);
  178.                 sel.addEventListener('click', selClicked);
  179.                 lastSelected = sel;
  180.                 lastSelectedTime = Date.now();
  181.             }
  182.         }
  183.     })*/
  184. })();